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36 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 17
Except for a somewhat less dense filamentous medullary region and
somewhat more bulbous terminal cells of the peripheral filaments, these
plants are indistinguishable from the Japanese species. Unfortunately
they are sterile and confirmation of this determintion must await the
collection of reproductive material. They are also structurally similar to
Nemalion virens which has similar bulbous terminal cells of the peripheral filaments. The medullary filaments as well as the peripheral filament cells in that species are of smaller diameter, and the entire plant is
taller and less densely branched.
Nemalion virens J. Agardh
Plate 1, fig. 4
J. Agardh, 1847, p. 8; J. Agardh, 1852, p. 420; B<£rgesen, 1942,
p. 27.
Thalli to 7.5 cm. high, consisting of several repeatedly dichotomously
branched erect parts from a small basal attachment; branch angles narrow; segments 4-6 mm. long throughout, or sometimes reduced to about
2 mm. near the apices, up to 2 mm. in diameter just above the base and
in mid-parts, gradually attenuated to 350-400 p, the tips blunt; thallus
composed of a central, loose, axial tissue of branched, interlaced filaments
3.5-4.5 p in diameter giving rise to a subcortex of gross filaments of large,
colorless, irregularly shaped cells from which arise groups of short,
branched, chromatophore-bearing peripheral filaments of the cortex; pigmented peripheral filaments moderately compact, consisting of series of
2-3 cells, the lower one or two narrow-elongate, much smaller than the
bearing subcortical cell, the terminal one appearing inflated, ovate, to
10-12 p in diameter; antheridia borne in whorled tufts on the sub-
terminal cells of the peripheral filaments.
Type: Holotype is a collection by Liebmann on sheet 54018 in the
Agardhian Herbarium of the Botanical Museum, University of Lund,
Sweden. An isotype is in the Botanical Museum, Copenhagen, and iso-
type slides are in HAHF.
Type locality : Punta San Agustin, Oaxaca ?, Mexico.
Mexican distribution: Baja Calif.—D. 3341, Cabeza Ballena,
near Cabo San Lucas, Nov.
The Baja California material shows convincing identity with the
Liebmann type. The species is distinctive in its abundant, regularly
spaced dichotomous branching, its size and pale yellowish green color. It
shows some structural similarity to Nemalion pulvinatum.

36 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 17
Except for a somewhat less dense filamentous medullary region and
somewhat more bulbous terminal cells of the peripheral filaments, these
plants are indistinguishable from the Japanese species. Unfortunately
they are sterile and confirmation of this determintion must await the
collection of reproductive material. They are also structurally similar to
Nemalion virens which has similar bulbous terminal cells of the peripheral filaments. The medullary filaments as well as the peripheral filament cells in that species are of smaller diameter, and the entire plant is
taller and less densely branched.
Nemalion virens J. Agardh
Plate 1, fig. 4
J. Agardh, 1847, p. 8; J. Agardh, 1852, p. 420; B